While Upgrading/Downgrading HDP in Ambari, if you see "Unable to determine the stack and stack version" it is possible the repo version has some inconsistency. Post Ambari2.6.x, should have repo_version table "resolved" column as 1 - If it shows "0" then run below update query. update repo_version set resolved = 1 Re-start Ambari and then attempt the operation again - it should go through. Note: As of now it is not a BUG as we could not able to reproduce the issue. ... View more

In Ambari when try to upgrade to HDP/HDF versions - after adding a new repo version, some times it might show disabled "install packages" button. There can be multiple reasons for this. 1. Check to stack_id which stack_id clusters table is pointing to. it should be pointed to correct current stack_id if not correct with update query 2. check clusterstate table - it should be pointing to correct current stack_id if not correct with update query 3. How to find my correct current stack_id run "select stack_id, version from repo_version" query - check the stack_id for your current hdp/hdf version. 4. so step1 and step2 should be pointing to stack_id returned in step3. There can be many other reasons like not having "upgrades" folder in stack folder or some other. ... View more